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I do not believe it has to do with vacuum pressure. If the brake booster is bad, like FredTJ said, it would cause and extremely hard pedal, not a soft one. Any leak in that part of the system wouldn't do that. The master cylinder seems to me like to be most likely the problem. I know it's a two chamber system, however, it would seem like both chamber seals would have to be bad, BUT, I do have full pressure at some stops. ChickenLover's theory could be true, but it is not a "full pressure then loss of pressure." It is one or the other. Any more feedback? I appreciate your thoughts so far, it has helped a great deal. Thanks in advance.
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1993 T4R 3.0L V6 W56 4.56's
SAS In Progress With '84 Front Axle, 4.88's
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